THREATPORT/VULNERABILITY/CVE-2009-3560
MEDIUM SEVERITY

CVE-2009-3560

Libexpat vulnerability

CVSS
5.0
EPSS
24.3%
EPSS pct
98th
Exploited
No known
The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used in the XML-Twig module for Perl, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with malformed UTF-8 sequences that trigger a buffer over-read, related to the doProlog function in lib/xmlparse.c, a different vulnerability than CVE-2009-2625 and CVE-2009-3720.
Affected vendor
Libexpat Project
Affected product
Libexpat
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness type (CWE)
  • CWE-119 — Improper Restriction of Operations within Memory Bounds
Published
2009-12-04

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 24.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2009-3560

  • Confirm whether Libexpat Project Libexpat is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2009-3560.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-3560

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-3560 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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